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Diffstat (limited to 'libudev/libudev-ctrl.c')
-rw-r--r--libudev/libudev-ctrl.c51
1 files changed, 47 insertions, 4 deletions
diff --git a/libudev/libudev-ctrl.c b/libudev/libudev-ctrl.c
index 61e0243383..e0ec2fa3d7 100644
--- a/libudev/libudev-ctrl.c
+++ b/libudev/libudev-ctrl.c
@@ -176,6 +176,8 @@ int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
{
struct udev_ctrl_connection *conn;
+ struct ucred ucred;
+ socklen_t slen;
const int on = 1;
conn = calloc(1, sizeof(struct udev_ctrl_connection));
@@ -188,14 +190,29 @@ struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
if (conn->sock < 0) {
if (errno != EINTR)
err(uctrl->udev, "unable to receive ctrl connection: %m\n");
- free(conn);
- return NULL;
+ goto err;
+ }
+
+ /* check peer credential of connection */
+ slen = sizeof(ucred);
+ if (getsockopt(conn->sock, SOL_SOCKET, SO_PEERCRED, &ucred, &slen) < 0) {
+ err(uctrl->udev, "unable to receive credentials of ctrl connection: %m\n");
+ goto err;
+ }
+ if (ucred.uid > 0) {
+ err(uctrl->udev, "sender uid=%i, message ignored\n", ucred.uid);
+ goto err;
}
- /* enable receiving of the sender credentials */
+ /* enable receiving of the sender credentials in the messages */
setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
udev_ctrl_ref(uctrl);
return conn;
+err:
+ if (conn->sock >= 0)
+ close(conn->sock);
+ free(conn);
+ return NULL;
}
struct udev_ctrl_connection *udev_ctrl_connection_ref(struct udev_ctrl_connection *conn)
@@ -333,6 +350,32 @@ struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
uctrl_msg->conn = conn;
udev_ctrl_connection_ref(conn);
+ /* wait for the incoming message */
+ for(;;) {
+ struct pollfd pfd[1];
+ int r;
+
+ pfd[0].fd = conn->sock;
+ pfd[0].events = POLLIN;
+
+ r = poll(pfd, 1, 10000);
+ if (r < 0) {
+ if (errno == EINTR)
+ continue;
+ goto err;
+ } else if (r == 0) {
+ err(udev, "timeout waiting for ctrl message\n");
+ goto err;
+ } else {
+ if (!(pfd[0].revents & POLLIN)) {
+ err(udev, "ctrl connection error: %m\n");
+ goto err;
+ }
+ }
+
+ break;
+ }
+
iov.iov_base = &uctrl_msg->ctrl_msg_wire;
iov.iov_len = sizeof(struct udev_ctrl_msg_wire);
memset(&smsg, 0x00, sizeof(struct msghdr));
@@ -342,7 +385,7 @@ struct udev_ctrl_msg *udev_ctrl_receive_msg(struct udev_ctrl_connection *conn)
smsg.msg_controllen = sizeof(cred_msg);
size = recvmsg(conn->sock, &smsg, 0);
if (size < 0) {
- err(udev, "unable to receive user udevd message: %m\n");
+ err(udev, "unable to receive ctrl message: %m\n");
goto err;
}
cmsg = CMSG_FIRSTHDR(&smsg);